Ferry boat



FIG. 1 is a front view of a ferry boat showing the claimed design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is an elevated front left perspective view thereof.

The broken lines in the figures show portions of the ferry boat subject matter that form no part of the claimed design. 

CLAIM The ornamental design for a ferry boat, as shown and described. 